Thermador Gas Oven: not igniting

Possible Causes

Faulty ignition system (igniter or spark components)

How to Identify: No spark or weak spark present when attempting ignition; clicking sound without ignition; visible damage or corrosion on electrodes.

Part: Igniter / Spark Electrode / Spark Ignition Switch / Spark Module

Clogged or dirty burner ports and ignition parts

How to Identify: Food crumbs, grease, or debris visible around burner ports or ignition electrode; cleaning improves or restores spark/ignition.

Part: Burner ports, burner caps, igniter surface

Gas supply issues

How to Identify: No gas flow detectable, other burners also fail; ensure gas valve fully open; smell of gas without ignition.

Part: Gas valve / gas line

Control module or wiring malfunction

How to Identify: Neither igniters nor switches respond; no clicking sounds; visible signs of control board damage or electrical faults.

Part: Control board / wiring harness

DIY Solutions

Clean ignition and burner components

Moderate 15-30 minutes

Tools Needed: soft brush, toothpick, cotton swabs

1. Ensure the oven is turned off and cool.
2. Remove any removable burner caps and gently clean debris from burner ports and ignition electrodes with a soft brush.
3. Use a toothpick or cotton swab to clear small clogs around ignition points.
4. Reassemble and test ignition.

⚠️ Safety First: Turn off power and gas supply before cleaning.

Check gas valve and supply

Easy 5-10 minutes

Tools Needed: none

1. Confirm the main gas shutoff valve to the oven is fully open.
2. Check if other gas appliances are operating to verify gas supply.
3. Ensure no strong gas odor persists; if there is, ventilate the area and do not attempt ignition.

⚠️ Safety First: If you smell strong gas, stop and ventilate; seek professional help immediately.

Professional Repairs

Replace igniter or ignition components

Estimated Cost: $50 - $250

Inspect and repair gas line or control board

Estimated Cost: $150 - $500+

When to Call a Professional

If there is a smell of gas without ignition that persists after ventilation

If spark is absent despite cleaning electrodes and burner ports

If there are signs of electrical faults or control board damage

If you are uncomfortable working with gas appliance components

Preventive Maintenance

• Regularly clean burner ports and ignition electrodes: Prevents debris buildup that can block ignition
  Frequency: Monthly or as needed
• Annual professional inspection: Identifies early wear on ignition components and gas supply issues
  Frequency: Annually

Frequently Asked Questions

Why is my Thermador Gas Oven not igniting?

Common causes include a faulty ignition system, clogged burner ports, or gas supply issues.

How do I fix Thermador Gas Oven not igniting myself?

Clean ignition and burner components, and check the gas valve to ensure it's open.

How much does it cost to fix not igniting?

Repair costs range from $50 to $500+, depending on whether parts need replacement or more extensive repairs are needed.

When should I call a technician for not igniting?

Call a technician if basic troubleshooting doesn't resolve the issue or if you suspect a gas leak.

References & Sources

• Thermador Gas Cooktops & Rangetops Troubleshooting Official
• Thermador Range Burner Not Igniting: Troubleshooting Tips Community

Can I Fix This Myself?

50%

DIY Success Rate Difficulty: Either

Common Issues Reported by Users

• Faulty ignitor (2 mentions)
• Defective control board (1 mentions)

User Suggested Solutions

1. Replace ignitor and fixing kits

   Success rate: 50.0%

2. Replace ignition device and control board

   Success rate: 0.0%

Community Discussions

left side burners not working

Parts replacement including fixing kits and ignitor.

DIY View on Reddit →

Source: Reddit r/appliancerepair